100+ Free CAAB AME B1.1 Exam Practice Questions

Pass your Bangladesh CAAB AME Licence Category B1.1 (Aeroplane Turbine) exam on the first try — instant access, no signup required.

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Sample CAAB AME B1.1 Exam Practice Questions

Try these sample questions to test your CAAB AME B1.1 Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a dual-spool gas turbine engine, which compressor stages are typically driven by the high-pressure turbine?

A.The rear compressor stages (HP compressor)

B.The forward compressor stages (LP compressor)

C.All compressor stages via a common shaft

D.The bypass fan and intermediate compressor stages

Explanation: In a dual-spool gas turbine, the high-pressure turbine (HPT) is connected to and drives the high-pressure compressor (HPC), which consists of the rear stages of the compressor section. The low-pressure turbine (LPT) drives the low-pressure compressor (LPC) and fan (if present) via a concentric shaft running inside the HP spool.

2What is the primary thermodynamic process occurring during combustion in a Brayton-cycle gas turbine engine?

A.Constant pressure heat addition

B.Constant volume heat addition

C.Constant temperature heat expansion

D.Isentropic compression

Explanation: The Brayton cycle operates on constant pressure (isobaric) heat addition in the combustion chamber. Fuel is continuously sprayed and burned in the airflow, causing expansion and temperature increase at approximately constant pressure, unlike reciprocating piston engines which use constant volume (Otto cycle) combustion.

3Which of the following describes the behavior of static pressure and velocity in a divergent duct?

A.Static pressure increases and velocity decreases

B.Static pressure decreases and velocity increases

C.Both static pressure and velocity increase

D.Both static pressure and velocity decrease

Explanation: According to Bernoulli's principle and the continuity equation, in a subsonic divergent duct, the cross-sectional area increases. This causes the velocity of the air to decrease, and consequently, the static pressure increases.

4What is the function of Variable Stator Vanes (VSVs) in an axial flow compressor?

A.To adjust the angle of incidence of air entering the rotor blades to prevent stall and surge

B.To increase the overall pressure ratio of the compressor at high altitude

C.To bypass high-pressure bleed air around the rear stages of the compressor

D.To change the direction of turbine rotation during starting cycles

Explanation: Variable Stator Vanes (VSVs) are angularly adjusted by the engine control system (e.g., FADEC) to match the airflow velocity at different engine speeds. By directing air onto the subsequent rotor stage at the optimum angle, they prevent airflow separation (stall) and subsequent compressor surge at low or transient RPMs.

5During engine operation, what is the primary source of electrical power for a Full Authority Digital Engine Control (FADEC) system?

A.A dedicated permanent magnet alternator (PMA) driven by the accessory gearbox

B.The aircraft auxiliary power unit (APU) generator

C.The aircraft main DC battery bus via a transformer rectifier unit

D.The high-output main engine AC generator

Explanation: A FADEC must have a highly reliable, independent power source to prevent engine shutdown in the event of complete aircraft electrical failure. Once the engine accelerates past a minimum speed (typically 10-15% N2), a dedicated Permanent Magnet Alternator (PMA) driven by the accessory gearbox supplies power directly to the FADEC.

6What is the purpose of Active Clearance Control (ACC) in a gas turbine engine?

A.To control turbine blade tip clearance by cooling the turbine casing with bleed air

B.To adjust the axial distance between the compressor rotor and stator disks

C.To regulate the amount of fuel delivered to the fuel nozzles at idle

D.To control the clearance between the accessory gearbox gears

Explanation: Active Clearance Control (ACC) uses cool air (usually fan bleed air or compressor bleed air) directed onto the exterior of the turbine casing. By cooling the casing during cruise, the casing shrinks slightly, reducing the clearance between the casing and the turbine blade tips, which minimizes gas leakage and improves engine thermal efficiency.

7Which type of combustion chamber is characterized by having multiple individual flame tubes housed within a single outer casing?

A.Can-annular combustion chamber

B.Multiple-can combustion chamber

C.Annular combustion chamber

D.Reverse-flow combustion chamber

Explanation: A can-annular combustion chamber features individual inner liners (can/flame tubes) arranged radially inside a single common outer air casing. This design combines the structural strength of can chambers with the compactness and uniform temperature distribution of annular chambers.

8In a gas turbine engine lubrication system, what is the function of the oil-to-fuel heat exchanger?

A.To cool the lubricating oil while pre-heating the fuel to prevent ice formation

B.To heat the engine oil during cold starts using hot fuel from the tanks

C.To mix oil and fuel together for combustion purposes

D.To pump fuel into the bearing compartments for emergency cooling

Explanation: The oil-to-fuel heat exchanger performs two functions simultaneously: it uses the relatively cold fuel flowing from the wing tanks to absorb heat from and cool the hot engine oil, and it heats the fuel, which prevents water in the fuel from freezing at high altitudes.

9What indicates a compressor surge during gas turbine engine operation?

A.Rapid rise in EGT, loud popping sounds, and fluctuation in RPM parameters

B.Steady decrease in fuel flow and drop in oil pressure

C.High frequency airframe vibration with no change in engine instruments

D.A sudden increase in cabin pressure and cooling rate

Explanation: Compressor surge is a complete reversal of airflow through the compressor. It is characterized by severe aerodynamic instability, a loud popping or banging sound, rapid fluctuations in compressor RPM (N1/N2), and a rapid rise in Exhaust Gas Temperature (EGT) due to the lack of cooling air entering the combustor.

10Which of the following turbine blade cooling methods involves passing air through small holes in the blade leading edge to create a thin boundary layer of cool air?

A.Film cooling

B.Convection cooling

C.Transpiration cooling

D.Impingement cooling

Explanation: Film cooling is a technique where compressor bleed air is routed into the hollow turbine blade and discharged through small holes on the outer surface. This air forms a thin, protective boundary layer (or film) over the exterior blade surface, shielding it from direct contact with high-temperature combustion gases.

About the CAAB AME B1.1 Exam Exam

The CAAB Aircraft Maintenance Engineer (AME) Category B1.1 licence allows the holder to certify maintenance on turbine-engine aeroplanes, covering structural components, powerplants, and mechanical/electrical systems, as well as minor avionics tasks. Candidates must pass theoretical module examinations under ANO Part-66 and meet experience requirements before certifying staff privileges are granted.

Assessment

Basic-knowledge modular examinations consisting of multiple-choice questions (MCQs), with some modules (7, 9, 10) requiring supplementary essay questions. This practice bank covers core syllabus modules (Module 11A, Module 15, Module 9, and Module 10) for Category B1.1.

Time Limit

MCQ modules are timed at approximately 75 seconds per question under the ANO Part-66 standard, with essay papers timed separately.

Passing Score

A minimum of 75 percent is required on each MCQ module exam. Essay papers are graded on a separate pass/fail standard.

Exam Fee

Per-module fees are set by CAAB's Airworthiness and Engineering Licensing Division. Check directly with CAAB or your approved Part-147 training organization for the latest fee structures. (Civil Aviation Authority of Bangladesh (CAAB))

CAAB AME B1.1 Exam Exam Content Outline

35%

ANO Part-66 Module 11A (Turbine Aeroplane)

Aerodynamics, structural design, landing gear, flight control, hydraulics, pneumatics, air conditioning, pressurization, fuel, oxygen, ice/rain protection, fire protection, and APU.

35%

ANO Part-66 Module 15 (Gas Turbine Engine)

Brayton cycle, engine performance, inlets, compressors, combustion, turbines, exhaust, lubrication, fuel, air, starting, ignition, and indicators.

15%

ANO Part-66 Module 9 (Human Factors)

Dirty Dozen, cognitive/physical performance, fatigue, stress, workplace layout, communication, error models, and teamwork.

15%

ANO Part-66 Module 10 (Aviation Legislation)

CAAB regulatory framework, Civil Aviation Rules 1984/2024, ANO Part-66 and Part-145 certification, CRS, MEL, ADs, and logbook rules.

How to Pass the CAAB AME B1.1 Exam Exam

What You Need to Know

Passing score: A minimum of 75 percent is required on each MCQ module exam. Essay papers are graded on a separate pass/fail standard.
Assessment: Basic-knowledge modular examinations consisting of multiple-choice questions (MCQs), with some modules (7, 9, 10) requiring supplementary essay questions. This practice bank covers core syllabus modules (Module 11A, Module 15, Module 9, and Module 10) for Category B1.1.
Time limit: MCQ modules are timed at approximately 75 seconds per question under the ANO Part-66 standard, with essay papers timed separately.
Exam fee: Per-module fees are set by CAAB's Airworthiness and Engineering Licensing Division. Check directly with CAAB or your approved Part-147 training organization for the latest fee structures.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CAAB AME B1.1 Exam Study Tips from Top Performers

1Focus heavily on the mechanical core modules (Module 11A and Module 15) as they carry the largest volume of questions and test critical technical systems.

2Review CAAB Civil Aviation Rules (CAR) 1984/2024 and specific ANO Part-66 amendments for aviation legislation (Module 10). Knowing key dates and timelines is highly beneficial.

3Ensure you understand both the physical principles (e.g., Brayton cycle, aerodynamics) and practical maintenance troubleshooting scenarios (e.g., compressor stall remedies, landing gear thermal relief).

Frequently Asked Questions

What is the role of CAAB ANO Part-66 in Bangladesh?

ANO Part-66 is the regulation issued by the Civil Aviation Authority of Bangladesh (CAAB) that defines the framework for AME licensing. It is closely aligned with European EASA Part-66 standards to maintain international compatibility.

What are the experience requirements for obtaining a CAAB Category B1.1 AME licence?

Under ANO Part-66, candidates who complete a CAAB-approved Part-147 basic training course (e.g., at BATC) require at least 2 years of practical aircraft maintenance experience. Those taking the direct-experience route without an approved course require at least 5 years (or 3 years for candidates with other relevant technical trade training).

How does the essay paper affect Module 9 and Module 10 examinations?

For Modules 7, 9, and 10, candidates must pass both the multiple-choice paper and a separate essay paper. A failure in either section requires a retake of that specific component under CAAB exam guidelines.

Can a B1.1 licence holder certify avionic work?

A B1.1 licence holder is authorized to certify minor avionic tasks that require only simple tests to prove serviceability. Complex avionic system maintenance and troubleshooting require a Category B2 licence.